If there are no errors, you may install it if you wish:
$ sudo make install
It will be installed in /usr/local/linapple folder, whre you can find linapple.conf file for changing some linapple settings,
and empty `images` and `ftp` folders, where Apple 2 images files and downloaded through FTP cached images are meant to be in.
Of course you are free to choose any directories of your choice changing it in Makefile in src directory.
Note: you should read/write permissions for these folders, or linapple could not work properly.
For linaaple ability to unpack .zip and .gz files on the fly (either from local disks or from FTP) you also need read/write access for linapple working folder (which by default is /usr/local/linapple), for linapple unpacks these files as drive0.dsk and drive1.dsk for drive 1 and 2 respectively.
OK. If you installed it, you are able to run emulator from any place, just run it like this:
$ linapple
If you have chosen not to install it, go to the upper directory then and run the beast:
$ cd ..
$ ./linapple
If all files are on their places, you should see an X-Window with splash screen.
Press F2 (or F3 before to choose some disk image in drive 1), and go to work.
Note: linapple needs some files in its current working directory for proper working.